M16C Datasheet, PDF (252/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C / 6N Group
Standard Serial I/O Mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Read Lock Bit Status Command
This command reads the lock bit status of the specified block. Execute the read lock bit status command
as explained below.
(1) Send the "7116" command code in the first byte of the transmission.
(2) Send addresses A8 to A15 and A16 to A23 in the second and the third bytes of the transmission
respectively.
(3) The lock bit data of the specified block are output in the fourth byte of the transmission. Write the
highest address of the specified block for the addresses A8 to A23 .
CLK1
TxD1
RxD1
7116
A8 to A16 to
A15
A23
DQ6
RTS1(BUSY)
Figure 25-9. Timing for reading lock bit status
Lock Bit Enable Command
This command enables the lock bit in blocks whose bit has been disabled with the lock bit disable
command. It functions in the same way as the WP pin in the parallel I/O mode. The command code "7A16"
is sent in the first byte of the serial transmission. This command enables the lock bit function only; it does
not set the lock bit itself.
CLK1
TxD1
7A16
RxD1
RTS1(BUSY)
Figure 25-10. Timing for enabling the lock bit
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